fmk-plugins

chore(single-shot-game-generation): append 'ultracode ultrathink' to original prompt

feat(single-shot-game-generation): add plugin for one-shot, art-directed game builds

feat(contract-first-prep): add contract-first parallel-build prep skill

fix(tdd-wf): harden to-c4 (C4 semantics, mandatory CLI validate, L3 fidelity) and to-wiki (hard SHA verify gate)

feat(tdd-wf): add /to-c4 C4 architecture skill (Structurizr DSL + c4.sh)